When it was actively maintained, Adobe Reader XI was highly recommended for its stability and specific productivity tools that have since evolved in newer versions:
This is often a GPU acceleration bug. Open Reader, go to Edit > Preferences > Page Display. Uncheck "Use 2D GPU acceleration" and "Smooth line art." adobe acrobat reader xi 11.0.23 download
rather than a full installer, the standard process involves two steps: End of support for Adobe Acrobat XI and Reader XI When it was actively maintained, Adobe Reader XI
For those seeking the functionality of Acrobat XI without the security trade-offs, several paths exist: When it was actively maintained
The 64-bit version is less common. Look for AdbeRdr11023_en_US_64bit.exe on Adobe’s FTP. Note that many browser plugins in Reader XI are 32-bit only.